Achieving Effective Thermal Performance of Street Canyons in Various Climatic Zones

Abdelhafez, Mohamed Hssan Hassan; Altaf, Fatmaelzhraa; Alshenaifi, Mohammad; Hamdy, Omar; Ragab, Ayman

doi:10.3390/su141710780

Cited by 10 publications

(7 citation statements)

References 61 publications

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“…Similarly, the increase in building height, which also leads to an increase in the aspect ratio, leads to a reduction of the sky-view factor, augments the proportion of shadowed areas on the ground, and therefore reduces the heat stress in summer. Similar observations have been made in some studies, which also concluded that deep street canyons (with a high aspect ratio) are beneficial to pedestrian thermal comfort [67].…”

Section: Impact Of Individual Morphology Indicators On Outdoor Therma...supporting

confidence: 89%

A Parametric-Simulation Method to Study the Interconnections between Urban-Street-Morphology Indicators and Their Effects on Pedestrian Thermal Comfort in Tropical Summer

Bedra

Zheng

et al. 2023

Sustainability

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Numerous studies have explored the impact of urban morphology and geometry on outdoor thermal comfort, intending to provide practical guidelines for urban designers. However, research findings have been inconsistent, in part due to differences in the climatic settings and the investigated heat-stress indicators. This study proposes a parametric-simulation framework to observe the behavior of thermal comfort according to the possible combinations of building density (BD), street aspect ratio (AR), and orientation. Conducted specifically under a hot-and-humid tropical-savanna summer condition, the study found that building density and aspect ratio were negatively correlated to the Universal Thermal Climate Index (UTCI), with R2 coefficients of 0.99 and 0.91, respectively. The UTCI was improved by a 1.0 °C per 10% increase in BD and by a 1.02 °C per unit of AR increase. The performance of street orientation was significantly influenced by wind direction, and strong inter-influences were found between the three morphology factors. These findings are useful guidelines not only for designing urban morphology but also for intuitively identifying the need for complementary vegetation and cooling materials when morphology indicators cannot reach their efficiency targets (e.g., when AR < 3.0 or building density is limited by local regulations and project specifications).

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Section: Impact Of Individual Morphology Indicators On Outdoor Therma...supporting

confidence: 89%

A Parametric-Simulation Method to Study the Interconnections between Urban-Street-Morphology Indicators and Their Effects on Pedestrian Thermal Comfort in Tropical Summer

Bedra

Zheng

et al. 2023

Sustainability

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“…Recently, more emphasis has been placed on understanding the relationship between urban features and local climate and devising mitigation and adaptation techniques to enhance urban thermal performance [7,8]. Several studies on the effects of various urban geometrical thermal mitigation measures on outdoor spaces have been conducted for hot, arid climate zones [9][10][11][12].…”

Section: Of 23mentioning

confidence: 99%

Investigating the Impact of Various Vegetation Scenarios on Outdoor Thermal Comfort in Low-Density Residential Areas of Hot Arid Regions

Gomaa,

El Menshawy,

Nabil

et al. 2024

Sustainability

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In hot, arid regions, outdoor spaces suffer from intense heat. This study explores how vegetation can improve outdoor thermal performance for pedestrians in low-density residential areas. Specifically, it seeks to identify the best combination of grass and trees for optimal comfort. Four scenarios were simulated using ENVI-met software, varying the proportions of grass and three tree types: 50% grass, 50% grass with 25% trees, 50% grass with 50% trees, and 50% grass with 75% trees. A reference scenario with no vegetation was also investigated. The simulated outputs encompassed air temperature (Ta), mean radiant temperature (Tmrt), relative humidity (RH), and physiologically equivalent temperature (PET). The findings show that scenarios with a higher percentage of trees exhibited the best reduction in air temperature, ranging from 0.2 k to 0.92 k. Additionally, the inclusion of trees and grass in the scenarios resulted in a substantial improvement in thermal performance, with an average reduction of 7.5 degrees in PET. Among the evaluated scenarios, the one comprising 75% trees and 50% grass exhibits the most noteworthy enhancement. This study underscores the significance of strategically positioning vegetation to coincide with prevailing wind patterns, thereby enhancing convective cooling mechanisms and improving overall thermal comfort levels. These insights offer valuable implications for urban planning and the development of sustainable design strategies.

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“…An important aspect of a passively designed building envelope is the reduced energy needed to maintain a comfortable inside temperature [6,16,21]. This method takes into account the heat gain from the outside, which is affected by the building's walls, fenestration, roof [38], foundation, thermal insulation [26,27], thermal mass [39], and external shading systems [40][41][42], into consideration [16,43]. Regardless of the ever-changing weather outside, this crucial aspect is what ultimately decides the quality of the structure and what governs the internal conditions [16,21,43,44].…”

Section: Investigating Energy Efficiency In Buildingsmentioning

confidence: 99%

Energy Efficiency Coupled with Lightweight Bricks: Towards Sustainable Building: A review

Tarek

El-Naggar

Sameh

et al. 2023

SVU-International Journal of Engineering Sciences and Applicati

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This study investigates energy use in the construction sector and the potential for reducing energy consumption by improving the thermal efficiency of various building components, including walls, windows, roofs, and floors. The evaluation included a discussion on the prospects of reducing energy use. The building envelope is one of the most important factors to consider in terms of the heating and cooling energy efficiency of buildings. Walls are the fundamental component of a building's envelope and should provide thermal and acoustic comfort without compromising the aesthetic features of the building. The walls have a heat transfer area that is substantially higher than average, and the amount of heat gained or lost depends on the temperatures of the wall's inner and outside surface areas. Therefore, walls have a vital role in reducing the energy consumption of buildings. Bricks are a necessary component of highperformance thermal insulation, and lightweight bricks are especially useful in this regard. Bricks that are specifically manufactured for use in wall construction play an essential role in the management of energy consumption. The study has, as a result, provided a synopsis of the production of lightweight bricks in accordance with the source of the raw materials (e.g. Agriculture and industrial waste, etc).

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Achieving Effective Thermal Performance of Street Canyons in Various Climatic Zones

Cited by 10 publications

References 61 publications

A Parametric-Simulation Method to Study the Interconnections between Urban-Street-Morphology Indicators and Their Effects on Pedestrian Thermal Comfort in Tropical Summer

A Parametric-Simulation Method to Study the Interconnections between Urban-Street-Morphology Indicators and Their Effects on Pedestrian Thermal Comfort in Tropical Summer

Investigating the Impact of Various Vegetation Scenarios on Outdoor Thermal Comfort in Low-Density Residential Areas of Hot Arid Regions

Energy Efficiency Coupled with Lightweight Bricks: Towards Sustainable Building: A review

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